Grand Father survived the crash-landing of his spaceship on the isolated Remnant Island after a catastrophic global war devastated civilization. The island served as the sole refuge for the surviving crew, though over time all others died, leaving only Grand Father and his adopted grandson, Conan. As an elder crew member, Grand Father preserved knowledge of pre-war technology and history, imparting it to Conan while raising him in isolation. He acted as Conan's primary caregiver and mentor, focusing on practical survival skills, resourcefulness, and adaptability to shape his grandson's abilities and worldview. His background as a survivor forged his resilience and self-sufficiency; he maintained the crashed spaceship as their shelter and utilized island resources to sustain their existence. His guidance emphasized harmony with the environment and preparedness for unforeseen challenges. This relationship was central to Conan's development, with Grand Father serving as both guardian and a source of wisdom about the past. Following Grand Father's eventual passing, Conan remained the island's sole inhabitant until the arrival of Lana. Though deceased before the story's main events, Grand Father's influence endured through the skills and values he instilled in Conan, enabling his grandson to navigate the post-apocalyptic world and its conflicts.